Iran and the United States began a fourth round of negotiations Sunday over Tehran’s rapidly advancing nuclear program, officials said, just ahead of a visit by President Donald Trump to the Middle East this week.

An Iranian official told CNN that recent indirect talks with the United States aimed at addressing Tehran’s nuclear program and lifting sanctions were “not genuine” from the American side and were likely designed from the outset as a “trap to draw the situation toward tension.

The talks seek to limit Iran’s nuclear program in exchange for the lifting of some of the crushing economic sanctions the U.S. has imposed.